In a couple of weeks I will get a 1&1 SIM free of charge as part of the 4DSL package. It's nice that 1&1 mobile phones allow free calls into the german fixed network and to 3 partner cards, but by using Asterisk and Call-by-Call providers it can be even more attractive.
What I mean is to enormously reduce the costs of mobile-to-mobile and international calls from a 1&1 mobile. A mobile-to-mobile call costs 0.29¤/min and an international call starts at 0.71¤/min
My idea is most likely not new and works as follows:
- the 1&1 mobile users dials in to a Asterisk server at home (can run on FBF I guess)
- Asterisk verifies the 1&1 mobile phone number from the CLIP
- Asterisks prompts the user to enter the target mobile phone# or international phone#
- Asterisk adds a cheap Call-by-Call prefix# to the target phone# (e.g. 01040 for a call to another national mobile phone (0.069¤/min) or 01054 for an international phone# (0.0138¤/min for US)
- Asterisks dials the number and forwards the 1&1 mobile user
Perhaps the scheme can be simplified by combining the home- and targetphone# and perhaps it can also be extended to roaming 1&1 users by using 'friendly' Asterisk servers.
What you can recognize is the enormous cost saving potential: a factor 3 cheaper for national mobile phone calls and a factor 100 for international calls.
Okay, I am fully aware that this is not a new idea
What I'd like to hear from you is details on how it can be implemented on a Fritzbox or separate Asterisk server.